Fifty days of strict lockdowns, followed by 30 days where measures are eased could be an effective strategy for reducing Covid-19 deaths while ensuring some level of economic protection, scientists claim. In an EU-backed study published on Wednesday, researchers from nine countries simulated how various lockdown strategies would impact the spread of the coronavirus. Many governments have imposed some form of lockdown to mitigate the transmission of the virus. But policymakers around the world are now calculating ways to gradually lift those measures as the pandemic weighs heavily on economic activity. Scientists suggested in the new report that an alternative, more effective approach to indefinite or milder lockdowns could be alternating stricter measures with intervals of relaxed social distancing.